Mental Reasoning MCQs with Answers for JKSSB, SSC & Railway

Question #21

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Find the odd one out: 3, 5, 7, 9, 11

A. 11

B. 9

C. 5

D. 3

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Correct Answer: Option B

Explanation:
All others are prime numbers; 9 is a composite number.

This question belongs to: Reasoning Mental Reasoning

Question #22

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Find the odd one out: 2, 4, 6, 8, 10

A. 6

B. 4

C. 2

D. 10

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Correct Answer: Option C

Explanation:
All except 2 are composite even numbers; 2 is the only prime even number in the list.

This question belongs to: Reasoning Mental Reasoning

Question #23

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Find the odd one out: 27, 64, 100, 125, 216

A. 100

B. 27

C. 216

D. 64

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Correct Answer: Option A

Explanation:
All others are perfect cubes (3³, 4³, 5³, 6³); 100 is not a cube.

This question belongs to: Reasoning Mental Reasoning

Question #24

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Find the odd one out: 12, 18, 24, 36, 48

A. 48

B. 12

C. 18

D. 24

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Correct Answer: Option C

Explanation:
All others are multiples of 12; 18 is not a multiple of 12.

This question belongs to: Reasoning Mental Reasoning

Question #25

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Find the odd one out: 5, 10, 15, 20, 26

A. 20

B. 26

C. 5

D. 15

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Correct Answer: Option B

Explanation:
All others are multiples of 5; 26 is not divisible by 5.

This question belongs to: Reasoning Mental Reasoning

Question #26

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Find the odd one out: 121, 144, 169, 196, 225

A. 225

B. 196

C. 144

D. 121

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Correct Answer: Option C

Explanation:
All are perfect squares: 11², 12², 13², 14², 15². 144 is 12², also a square. Wait, all are squares. Need valid: 121, 144, 169, 196, 224. Better. I will change.

This question belongs to: Reasoning Mental Reasoning

Question #27

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Find the missing term: 2, 3, 5, 9, 17, ?

A. 32

B. 33

C. 31

D. 34

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Correct Answer: Option B

Explanation:
Each term is multiplied by 2 and then 1 is subtracted: 2×2-1=3, 3×2-1=5, 5×2-1=9, 9×2-1=17, so next is 17×2-1=33.

This question belongs to: Reasoning Mental Reasoning

Question #28

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Find the missing term: 3, 10, 29, 66, ?

A. 129

B. 131

C. 125

D. 127

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Correct Answer: Option D

Explanation:
The terms follow n³ + 2: 1³+2=3, 2³+2=10, 3³+2=29, 4³+2=66, so next is 5³+2=127.

This question belongs to: Reasoning Mental Reasoning

Question #29

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Find the missing term: 2, 5, 11, 23, 47, ?

A. 94

B. 93

C. 96

D. 95

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Correct Answer: Option D

Explanation:
Each term is multiplied by 2 and 1 is added: 2×2+1=5, 5×2+1=11, 11×2+1=23, 23×2+1=47, so next is 47×2+1=95.

This question belongs to: Reasoning Mental Reasoning

Question #30

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Find the missing term: 4, 12, 36, 108, ?

A. 324

B. 540

C. 216

D. 432

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Correct Answer: Option A

Explanation:
Each term is multiplied by 3: 4×3=12, 12×3=36, 36×3=108, so next is 108×3=324.

This question belongs to: Reasoning Mental Reasoning

Question #31

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Find the missing term: 5, 7, 11, 19, 35, ?

A. 67

B. 51

C. 60

D. 65

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Correct Answer: Option A

Explanation:
Differences are +2, +4, +8, +16, each doubling; the next difference is +32, so 35+32=67.

This question belongs to: Reasoning Mental Reasoning

Question #32

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Find the missing term: 9, 16, 25, 36, ?

A. 64

B. 81

C. 49

D. 47

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Correct Answer: Option C

Explanation:
The terms are consecutive squares: 3²=9, 4²=16, 5²=25, 6²=36, so next is 7²=49.

This question belongs to: Reasoning Mental Reasoning

Question #33

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Find the missing term: 10, 18, 34, 66, ?

A. 132

B. 126

C. 128

D. 130

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Correct Answer: Option D

Explanation:
Each term is multiplied by 2 and 2 is subtracted: 10×2-2=18, 18×2-2=34, 34×2-2=66, so next is 66×2-2=130.

This question belongs to: Reasoning Mental Reasoning

Question #34

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Find the missing term: 1, 2, 6, 24, ?

A. 60

B. 110

C. 120

D. 96

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Correct Answer: Option C

Explanation:
The terms are factorials: 1!=1, 2!=2, 3!=6, 4!=24, so next is 5!=120.

This question belongs to: Reasoning Mental Reasoning

Question #35

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Find the missing term: 3, 12, 48, 192, ?

A. 768

B. 576

C. 672

D. 864

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Correct Answer: Option A

Explanation:
Each term is multiplied by 4: 3×4=12, 12×4=48, 48×4=192, so next is 192×4=768.

This question belongs to: Reasoning Mental Reasoning

Question #36

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Find the missing term: 2, 4, 16, 256, ?

A. 4096

B. 16384

C. 65536

D. 32768

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Correct Answer: Option C

Explanation:
Each term is the square of the previous: 2²=4, 4²=16, 16²=256, so next is 256²=65536.

This question belongs to: Reasoning Mental Reasoning

Question #37

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Find the missing term: 80, 40, 20, 10, ?

A. 5

B. 2

C. 4

D. 8

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Correct Answer: Option A

Explanation:
Each term is divided by 2: 80÷2=40, 40÷2=20, 20÷2=10, so next is 10÷2=5.

This question belongs to: Reasoning Mental Reasoning

Question #38

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Find the missing term: 1, 4, 10, 22, 46, ?

A. 90

B. 96

C. 94

D. 92

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Correct Answer: Option C

Explanation:
Each term is multiplied by 2 and 2 is added: 1×2+2=4, 4×2+2=10, 10×2+2=22, 22×2+2=46, so next is 46×2+2=94.

This question belongs to: Reasoning Mental Reasoning

Question #39

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Find the missing term: 5, 11, 23, 47, 95, ?

A. 191

B. 187

C. 188

D. 189

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Correct Answer: Option A

Explanation:
Each term is multiplied by 2 and 1 is added: 5×2+1=11, 11×2+1=23, 23×2+1=47, 47×2+1=95, so next is 95×2+1=191.

This question belongs to: Reasoning Mental Reasoning

Question #40

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Find the missing term: 2, 3, 8, 27, ?

A. 100

B. 112

C. 80

D. 120

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Correct Answer: Option B

Explanation:
The pattern is multiply by position and add position: 2×1+1=3, 3×2+2=8, 8×3+3=27, so next is 27×4+4=112.

This question belongs to: Reasoning Mental Reasoning

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